klist.heimdal: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/klist.heimdal - from package: heimdal-clients

You may install the required package with command apt-get install {package}

Error in other languages:
klist.heimdal: bevel nie gevind nie
klist.heimdal: comandă negăsită
klist.heimdal: comando não encontrado
klist.heimdal: commande introuvable
klist.heimdal: command not found
klist.heimdal: käsku ei ole
klist.heimdal: không tìm thấy lệnh
klist.heimdal: komanda nerasta
klist.heimdal: Kommando nicht gefunden.
klist.heimdal: kommandot finns inte
klist.heimdal: komut yok
klist.heimdal: nie znaleziono polecenia
klist.heimdal: níor aimsíodh an t-ordú
klist.heimdal: no se encontró la orden
klist.heimdal: no s'ha trobat l'ordre
klist.heimdal: opdracht niet gevonden
klist.heimdal: parancs nem található
klist.heimdal: perintah tidak ditemukan
klist.heimdal: príkaz nenájdený
klist.heimdal: příkaz nenalezen
klist.heimdal: команда не найдена
klist.heimdal: командата не е открита
klist.heimdal: 命令找不到
klist.heimdal: コマンドが見つかりません